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1997 F250 7.3L Diesel Headlight Problem

After driving with headlights on for approximately 1/2 hour my headlights will blink off/on. The time off varies and increases until it's dangerous. No issue with dash lights or engine operation. Any suggestions as to the cause of this issue would be appreciated.
 

blacksnapon

Moderator
Staff member
usually dimmer switch/combination switch.
 

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